1b700c9975
We used libaudit to map ids to syscall names and vice-versa, but that
imposes a delay in supporting new syscalls, having to wait for libaudit
to get those new syscalls on its tables.
To remove that delay, for x86_64 initially, grab a copy of
arch/x86/entry/syscalls/syscall_64.tbl and use it to generate those
tables.
Syscalls currently not available in audit-libs:
# trace -e copy_file_range,membarrier,mlock2,pread64,pwrite64,timerfd_create,userfaultfd
Error: Invalid syscall copy_file_range, membarrier, mlock2, pread64, pwrite64, timerfd_create, userfaultfd
Hint: try 'perf list syscalls:sys_enter_*'
Hint: and: 'man syscalls'
#
With this patch:
# trace -e copy_file_range,membarrier,mlock2,pread64,pwrite64,timerfd_create,userfaultfd
8505.733 ( 0.010 ms): gnome-shell/2519 timerfd_create(flags: 524288) = 36
8506.688 ( 0.005 ms): gnome-shell/2519 timerfd_create(flags: 524288) = 40
30023.097 ( 0.025 ms): qemu-system-x8/24629 pwrite64(fd: 18, buf: 0x7f63ae382000, count: 4096, pos: 529592320) = 4096
31268.712 ( 0.028 ms): qemu-system-x8/24629 pwrite64(fd: 18, buf: 0x7f63afd8b000, count: 4096, pos: 2314133504) = 4096
31268.854 ( 0.016 ms): qemu-system-x8/24629 pwrite64(fd: 18, buf: 0x7f63afda2000, count: 4096, pos: 2314137600) = 4096
Cc: Adrian Hunter <adrian.hunter@intel.com>
Cc: David Ahern <dsahern@gmail.com>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Wang Nan <wangnan0@huawei.com>
Link: http://lkml.kernel.org/n/tip-51xfjbxevdsucmnbc4ka5r88@git.kernel.org
[ Added make dep for 'prepare' in 'LIBPERF_IN', fix by Wang Nan to fix parallell build ]
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
135 lines
3 KiB
C
135 lines
3 KiB
C
/*
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* System call table mapper
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*
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* (C) 2016 Arnaldo Carvalho de Melo <acme@redhat.com>
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms and conditions of the GNU General Public License,
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* version 2, as published by the Free Software Foundation.
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*
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* This program is distributed in the hope it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
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* more details.
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*/
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#include "syscalltbl.h"
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#include <stdlib.h>
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#ifdef HAVE_SYSCALL_TABLE
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#include <linux/compiler.h>
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#include <string.h>
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#include "util.h"
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#if defined(__x86_64__)
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#include <asm/syscalls_64.c>
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const int syscalltbl_native_max_id = SYSCALLTBL_x86_64_MAX_ID;
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static const char **syscalltbl_native = syscalltbl_x86_64;
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#endif
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struct syscall {
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int id;
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const char *name;
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};
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static int syscallcmpname(const void *vkey, const void *ventry)
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{
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const char *key = vkey;
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const struct syscall *entry = ventry;
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return strcmp(key, entry->name);
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}
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static int syscallcmp(const void *va, const void *vb)
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{
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const struct syscall *a = va, *b = vb;
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return strcmp(a->name, b->name);
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}
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static int syscalltbl__init_native(struct syscalltbl *tbl)
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{
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int nr_entries = 0, i, j;
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struct syscall *entries;
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for (i = 0; i <= syscalltbl_native_max_id; ++i)
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if (syscalltbl_native[i])
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++nr_entries;
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entries = tbl->syscalls.entries = malloc(sizeof(struct syscall) * nr_entries);
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if (tbl->syscalls.entries == NULL)
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return -1;
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for (i = 0, j = 0; i <= syscalltbl_native_max_id; ++i) {
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if (syscalltbl_native[i]) {
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entries[j].name = syscalltbl_native[i];
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entries[j].id = i;
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++j;
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}
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}
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qsort(tbl->syscalls.entries, nr_entries, sizeof(struct syscall), syscallcmp);
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tbl->syscalls.nr_entries = nr_entries;
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return 0;
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}
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struct syscalltbl *syscalltbl__new(void)
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{
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struct syscalltbl *tbl = malloc(sizeof(*tbl));
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if (tbl) {
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if (syscalltbl__init_native(tbl)) {
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free(tbl);
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return NULL;
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}
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}
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return tbl;
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}
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void syscalltbl__delete(struct syscalltbl *tbl)
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{
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zfree(&tbl->syscalls.entries);
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free(tbl);
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}
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const char *syscalltbl__name(const struct syscalltbl *tbl __maybe_unused, int id)
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{
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return id <= syscalltbl_native_max_id ? syscalltbl_native[id]: NULL;
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}
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int syscalltbl__id(struct syscalltbl *tbl, const char *name)
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{
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struct syscall *sc = bsearch(name, tbl->syscalls.entries,
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tbl->syscalls.nr_entries, sizeof(*sc),
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syscallcmpname);
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return sc ? sc->id : -1;
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}
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#else /* HAVE_SYSCALL_TABLE */
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#include <libaudit.h>
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struct syscalltbl *syscalltbl__new(void)
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{
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struct syscalltbl *tbl = malloc(sizeof(*tbl));
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if (tbl)
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tbl->audit_machine = audit_detect_machine();
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return tbl;
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}
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void syscalltbl__delete(struct syscalltbl *tbl)
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{
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free(tbl);
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}
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const char *syscalltbl__name(const struct syscalltbl *tbl, int id)
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{
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return audit_syscall_to_name(id, tbl->audit_machine);
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}
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int syscalltbl__id(struct syscalltbl *tbl, const char *name)
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{
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return audit_name_to_syscall(name, tbl->audit_machine);
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}
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#endif /* HAVE_SYSCALL_TABLE */
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